Which of the following statements concerning cargo is correct?（）
A. Cargoes are any type of goods transported by any type of ships
B. Cargoes are goods transported in bulk
Cargoes usually include goods transported in bulk and in containers
D. Cargoes are usually packaged in container
轻型汽车发动机曲轴做动平衡试验时，允许误差为（）g.m。
A. 5～15
B. 10～35
C. 10～18
D. 10～50
离心机的进料浓度是多少？产品湿盐含水量要求是多少？
以下哪些属于矿物的特殊性质（）。
A. 磁性
B. 发光性
C. 特殊的味道
D. 发射性
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